chemical ionization

in mass spectrometry
https://doi.org/10.1351/goldbook.C01026
This concerns the process whereby new @I03183@ species are formed when gaseous molecules interact with ions. The process may involve transfer of an electron, @P04906@ or other charged species between the reactants. When a positive ion results from chemical @I03183@, the term may be used without qualification. When a negative ion is involved, the term negative ion chemical @I03183@ should be used; note that negative ion formation by @A00512@ of a free electron does not fall within this definition. Chemical @I03183@ and chemi-@I03183@ are two terms which should not be used interchangeably.
See:
electron attachment
See also:
chemi-ionization
Sources:
Orange Book, 2nd ed., p. 204 [Terms]
PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2179 [Terms] [Paper]
PAC, 1991, 63, 1541. (Recommendations for nomenclature and symbolism for mass spectroscopy (including an appendix of terms used in vacuum technology). (Recommendations 1991)) on page 1547 [Terms] [Paper]